1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7281405643e88613531e97debd4b7147541b879a2d2dfa290086303e23c0b0f9. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cfd3068b-5992-4ad4-a55b-07436a4f51ce.json and https://artists.proofprofile.net/proofs/artist/cfd3068b-5992-4ad4-a55b-07436a4f51ce.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc6c0f87a83b4ab9f9892e5ec690d5e3bfd2ce0d00e93202f6b2dd30d6e37057. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPS2206091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa70fb5eb9cb2fa0276616e9fb667d4950acace27a0675ed990f35d5e810cf6c0. Chain 2 (Bitcoin): anchored in block 958613 (2026-07-18T21:35:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPS2206093.
そとろいど (feat. 初音ミク & 東北きりたん)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x015d1f63103f27f552dc5c8801b20da7d223e50eeeb81f0954e5cda77a65c1bf. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPS2206094.
ボーレイ節 (feat. ストピくん & 東北きりたん)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x487609997825dca21d658b45b6afbe5e6e1911e228d79d9c423091b9aa514ba9. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPS2206095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd60f97041113c383981ef242a3abcd949c9e3d07437c33dce7b0742e06762ed1. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPR2298563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd421a7c3d5b5f16b89bb5beb5cd46137c49928c5a5d5ecbcf466b9f51e32dd9f. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPR2298565.
さかなになりたくない (feat. 琴葉 茜・葵 & 根音ネネ)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1a57e76e1f4241039328ae1e7fefd5b91b8fbd72f20633173aa4dfcd2ed93c0. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPR2298568.
セシウムの降る夜に (feat. 琴葉 茜・葵 & 重音テト)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08f41388d604d1a10d815eb1df90cf650944a3a826cfc0ab89b325a5c38eb97. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPR2298572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a5db0abf56e6fd84ebb8beddba141485868d553a2f345b88d4c9325e6c1c32. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPR2298574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d5310a62b1a9cb2f398fad46842eaf1ece8284cd24d5bfcf065b85f306202c. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPR2298576.
暮しガスメータ (feat. 琴葉 茜・葵, 根音ネネ & ストピくん)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48f06dee0a1afa6ce35b0f8708699634013127bfdceee8d0a102304547e09390. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPU2214970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff0d79b28891ce6555a901cdbf7830c35b2d91c3c0cd3656aaab7d2952daecf0. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPU2214995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cbe5f8e1f15cd75db7cd525bab8d8326e2479e7f9e061959e531b096b5b7324. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPU2214999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac400e6eead7241223cc14267c5756c732726ce0fd6c16d6c41de6fb3a93f08e. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPU2215003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26c401ba10f64339f69bb965a60958a8703b8302d0e2181ef31e25c845edc300. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPA652306739.
さよなら幽霊無人街（制作：玄米ねこまんま）
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e6e68178c7f643e78c175ae2fe6d463003f866cd209d21c39088698449c1ece. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPY2310950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6577e23d46d45e84f74d851785b1dbf35feaccfc985ced5d8a38ff6fc8e5f39. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPY2310961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31398fb6ac2bbabc70352566e5baef19813b0c8fbb7ea09badf80b21b0653f64. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPD2564401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19a9d4f6410ffd07d80eee44c9d8e53ec8c53833afd5599d5f5cdffc4a5bbae9. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPH2503254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x667ff398f3c8a26ff62cfe008d6d0b0d38151a276adbd20c2ddce1f59fa7dc32. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPH2504146.